getSecuredApiKeyRemainingValidity is not available in browser bundle

[AlexMeah]

I am trying to implement automatic key refresh using getSecuredApiKeyRemainingValidity but the function only exported in the node bundle.

Would you accept a PR to make getSecuredApiKeyRemainingValidity work in the browser?

[Haroenv]

Officially this module still supports down to IE11, but as the method would be newly added to browser bundles I think it should be ok. What method do you have in mind that's isomorphic?

[AlexMeah]

Depending on what Node versions you support atob landed as a global in v16 nodejs/node#37786 and is compatible back to IE10.

[shortcuts]

closing in favor of a more recent issue on that matter #1583